import 'package:flutter/material.dart';
import 'package:yd_app_flutter/app/default_page/default_page.dart';
import 'package:yd_app_flutter/app/home/home_page.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _selectedIndex = 0;
  List <Widget> pageList = [HomePage(), DefaultPage(), DefaultPage()];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      // appBar: AppBar( //导航栏
      //   // title: Text("App Name"),
      //   backgroundColor: Colors.white,
      //   elevation: 1.0,
      //   actions: <Widget>[ //导航栏右侧菜单
      //     IconButton(icon: Icon(Icons.share), onPressed: () {}),
      //   ],
      // ),
      body: pageList[_selectedIndex],
      bottomNavigationBar: BottomNavigationBar( // 底部导航
        items: <BottomNavigationBarItem>[
          BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
          BottomNavigationBarItem(icon: Icon(Icons.business), label: 'Business'),
          BottomNavigationBarItem(icon: Icon(Icons.school), label: 'School'),
        ],
        currentIndex: _selectedIndex,
        fixedColor: Colors.blue,
        onTap: _onItemTapped,
      ),
      floatingActionButton: FloatingActionButton( //悬浮按钮
          child: Icon(Icons.add),
          onPressed:_onAdd
      ),
    );
  }

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }
  void _onAdd(){
  }
}
